animation-worklet/current-time.https.html

<!DOCTYPE html>
<meta charset=utf-8>
<title>The current time of a worklet animation</title>
<link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="common.js"></script>

<div id="box"></div>

<script>
'use strict';

function CreateAnimation() {
  const box = document.getElementById('box');
  const effect = new KeyframeEffect(
      box,
      { height: ['100px', '50px'] },
      10000);

  return new WorkletAnimation('passthrough', effect);
}

setup(setupAndRegisterTests, {explicit_done: true});

function setupAndRegisterTests() {
  registerPassthroughAnimator().then(() => {
    promise_test(async t => {
      const animation = CreateAnimation();
      animation.play();

      assert_equals(animation.currentTime, 0,
        'Current time returns the hold time set when entering the play-pending' +
        'state');

      animation.cancel();
    }, 'The current time returns the hold time when set');

    promise_test(async t => {
      const animation = CreateAnimation();
      animation.play();

      // Allow one async animation frame to pass so that animation is running.
      await waitForAsyncAnimationFrames(1);
      assert_equals(animation.playState, "running");
      // Allow time to advance so that we have a non-zero current time.
      await waitForDocumentTimelineAdvance();
      const timelineTime = document.timeline.currentTime;
      assert_greater_than(animation.currentTime, 0);
      assert_times_equal(animation.currentTime, (timelineTime - animation.startTime));

      animation.cancel();
    }, 'The current time is calculated from the timeline time and start time');

    done();
  });
}

// TODO(majidvp): Add tests for playbackRate and animations that are not
// associated with a timeline once these are supported in  WorkletAnimation.
// http://crbug.com/833846
</script>